diff options
Diffstat (limited to 'tools/csr_h4.c')
| -rw-r--r-- | tools/csr_h4.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/tools/csr_h4.c b/tools/csr_h4.c new file mode 100644 index 0000000..3371770 --- /dev/null +++ b/tools/csr_h4.c @@ -0,0 +1,165 @@ +/* + * + * BlueZ - Bluetooth protocol stack for Linux + * + * Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <errno.h> +#include <fcntl.h> +#include <unistd.h> +#include <string.h> +#include <stdint.h> +#include <termios.h> + +#include "csr.h" + +static uint16_t seqnum = 0x0000; + +static int fd = -1; + +int csr_open_h4(char *device) +{ + struct termios ti; + + if (!device) + device = "/dev/ttyS0"; + + fd = open(device, O_RDWR | O_NOCTTY); + if (fd < 0) { + fprintf(stderr, "Can't open serial port: %s (%d)\n", + strerror(errno), errno); + return -1; + } + + tcflush(fd, TCIOFLUSH); + + if (tcgetattr(fd, &ti) < 0) { + fprintf(stderr, "Can't get port settings: %s (%d)\n", + strerror(errno), errno); + close(fd); + return -1; + } + + cfmakeraw(&ti); + + ti.c_cflag |= CLOCAL; + ti.c_cflag |= CRTSCTS; + + cfsetospeed(&ti, B38400); + + if (tcsetattr(fd, TCSANOW, &ti) < 0) { + fprintf(stderr, "Can't change port settings: %s (%d)\n", + strerror(errno), errno); + close(fd); + return -1; + } + + tcflush(fd, TCIOFLUSH); + + return 0; +} + +static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length) +{ + unsigned char cp[254], rp[254]; + uint8_t cmd[10]; + uint16_t size; + int len, offset = 3; + + size = (length < 8) ? 9 : ((length + 1) / 2) + 5; + + cmd[0] = command & 0xff; + cmd[1] = command >> 8; + cmd[2] = size & 0xff; + cmd[3] = size >> 8; + cmd[4] = seqnum & 0xff; + cmd[5] = seqnum >> 8; + cmd[6] = varid & 0xff; + cmd[7] = varid >> 8; + cmd[8] = 0x00; + cmd[9] = 0x00; + + memset(cp, 0, sizeof(cp)); + cp[0] = 0x01; + cp[1] = 0x00; + cp[2] = 0xfc; + cp[3] = (size * 2) + 1; + cp[4] = 0xc2; + memcpy(cp + 5, cmd, sizeof(cmd)); + memcpy(cp + 15, value, length); + + if (write(fd, cp, (size * 2) + 5) < 0) + return -1; + + switch (varid) { + case CSR_VARID_COLD_RESET: + case CSR_VARID_WARM_RESET: + case CSR_VARID_COLD_HALT: + case CSR_VARID_WARM_HALT: + return 0; + } + + do { + if (read(fd, rp, 1) < 1) + return -1; + } while (rp[0] != 0x04); + + if (read(fd, rp + 1, 2) < 2) + return -1; + + do { + len = read(fd, rp + offset, sizeof(rp) - offset); + offset += len; + } while (offset < rp[2] + 3); + + if (rp[0] != 0x04 || rp[1] != 0xff || rp[3] != 0xc2) { + errno = EIO; + return -1; + } + + if ((rp[12] + (rp[13] << 8)) != 0) { + errno = ENXIO; + return -1; + } + + memcpy(value, rp + 14, length); + + return 0; +} + +int csr_read_h4(uint16_t varid, uint8_t *value, uint16_t length) +{ + return do_command(0x0000, seqnum++, varid, value, length); +} + +int csr_write_h4(uint16_t varid, uint8_t *value, uint16_t length) +{ + return do_command(0x0002, seqnum++, varid, value, length); +} + +void csr_close_h4(void) +{ + close(fd); +} |